/*!	 state_normal.cpp
**	 Template File
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**	Copyright (c) 2007, 2008 Chris Moore
**	Copyright (c) 2009 Nikita Kitaev
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
*/

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include <synfig/general.h>

#include <gtkmm/dialog.h>
#include <gtkmm/entry.h>
#include <gdk/gdkkeysyms.h>

#include <synfig/valuenodes/valuenode_animated.h>
#include <synfig/valuenodes/valuenode_blinecalcvertex.h>
#include <synfig/valuenodes/valuenode_composite.h>
#include <synfig/valuenodes/valuenode_const.h>
#include <synfig/valuenodes/valuenode_dynamiclist.h>
#include <synfigapp/action_system.h>

#include "state_normal.h"
#include "canvasview.h"
#include "workarea.h"
#include "app.h"

#include <synfigapp/action.h>
#include "event_mouse.h"
#include "event_layerclick.h"
#include "event_keyboard.h"
#include "duck.h"
#include <synfig/angle.h>
#include <synfigapp/main.h>

#include <gui/localization.h>
#endif

using namespace std;
using namespace etl;
using namespace synfig;
using namespace studio;

#ifndef EPSILON
#define EPSILON	0.0000001
#endif

#if !GTK_CHECK_VERSION(2, 21, 0)
#define GDK_KEY_Control_L GDK_Control_L
#define GDK_KEY_Control_R GDK_Control_R
#define GDK_KEY_Shift_L GDK_Shift_L
#define GDK_KEY_Shift_R GDK_Shift_R
#define GDK_KEY_Alt_L GDK_Alt_L
#define GDK_KEY_Alt_R GDK_Alt_R
#define GDK_KEY_Meta_L GDK_Meta_L
#define GDK_KEY_Meta_R GDK_Meta_R
#define GDK_KEY_space GDK_space
#endif

StateNormal studio::state_normal;

class DuckDrag_Combo : public DuckDrag_Base
{
    synfig::Vector last_move;
    synfig::Vector drag_offset;
    synfig::Vector center;
    synfig::Vector snap;

    synfig::Angle original_angle;
    synfig::Real original_mag;

    std::vector<synfig::Vector> last_;
    std::vector<synfig::Vector> positions;

    bool bad_drag;
    bool move_only;

    bool is_moving;

public:
    CanvasView* canvas_view_;
    bool scale;
    bool rotate;
    bool constrain;
    DuckDrag_Combo();
    void begin_duck_drag(Duckmatic* duckmatic, const synfig::Vector& begin);
    bool end_duck_drag(Duckmatic* duckmatic);
    void duck_drag(Duckmatic* duckmatic, const synfig::Vector& vector);

    etl::handle<synfigapp::CanvasInterface> get_canvas_interface()const
    {
        return canvas_view_->canvas_interface();
    }
};

class studio::StateNormal_Context : public sigc::trackable
{
    CanvasView* canvas_view_;

    etl::handle<DuckDrag_Combo> duck_dragger_;

    Gtk::Table options_table;

    bool ctrl_pressed;
    bool alt_pressed;
    bool shift_pressed;
    bool space_pressed;

    void set_ctrl_pressed(bool value);
    void set_alt_pressed(bool value);
    void set_shift_pressed(bool value);
    void set_space_pressed(bool value);

public:

    void refresh_cursor();

    bool get_rotate_flag()const
    {
        if (duck_dragger_) {
            return duck_dragger_->rotate;
        } else {
            return false;
        }
    }
    void set_rotate_flag(bool x)
    {
        if (duck_dragger_ && x != duck_dragger_->rotate) {
            duck_dragger_->rotate = x;
            refresh_cursor();
        }
    }

    bool get_scale_flag()const
    {
        if (duck_dragger_) {
            return duck_dragger_->scale;
        } else {
            return false;
        }
    }
    void set_scale_flag(bool x)
    {
        if (duck_dragger_ && x != duck_dragger_->scale) {
            duck_dragger_->scale = x;
            refresh_cursor();
        }
    }

    bool get_constrain_flag()const
    {
        if (duck_dragger_) {
            return duck_dragger_->constrain;
        } else {
            return false;
        }
    }
    void set_constrain_flag(bool x)
    {
        if (duck_dragger_ && x != duck_dragger_->constrain) {
            duck_dragger_->constrain = x;
            refresh_cursor();
        }
    }

    bool get_alternative_flag()const
    {
        return get_canvas_view()
               && get_canvas_view()->get_work_area()
               && get_canvas_view()->get_work_area()->get_alternative_mode();
    }
    void set_alternative_flag(bool x)
    {
        if (get_canvas_view()
                && get_canvas_view()->get_work_area()
                && get_canvas_view()->get_work_area()->get_alternative_mode() != x) {
            get_canvas_view()->get_work_area()->set_alternative_mode(x);
            get_canvas_view()->get_work_area()->queue_draw();
            refresh_cursor();
        }
    }

    bool get_lock_animation_flag()const
    {
        return get_canvas_view()
               && get_canvas_view()->get_work_area()
               && get_canvas_view()->get_work_area()->get_lock_animation_mode();
    }
    void set_lock_animation_flag(bool x)
    {
        if (get_canvas_view()
                && get_canvas_view()->get_work_area()
                && get_canvas_view()->get_work_area()->get_lock_animation_mode() != x) {
            get_canvas_view()->get_work_area()->set_lock_animation_mode(x);
            get_canvas_view()->get_work_area()->queue_draw();
            refresh_cursor();
        }
    }

    StateNormal_Context(CanvasView* canvas_view);

    ~StateNormal_Context();

    CanvasView* get_canvas_view()const
    {
        return canvas_view_;
    }
    etl::handle<synfigapp::CanvasInterface> get_canvas_interface()const
    {
        return canvas_view_->canvas_interface();
    }
    synfig::Canvas::Handle get_canvas()const
    {
        return canvas_view_->get_canvas();
    }
    WorkArea * get_work_area()const
    {
        return canvas_view_->get_work_area();
    }

    Smach::event_result event_stop_handler(const Smach::event& x);
    Smach::event_result event_refresh_handler(const Smach::event& x);
    Smach::event_result event_refresh_ducks_handler(const Smach::event& x);
    Smach::event_result event_undo_handler(const Smach::event& x);
    Smach::event_result event_redo_handler(const Smach::event& x);
    Smach::event_result event_mouse_button_down_handler(const Smach::event& x);
    Smach::event_result event_multiple_ducks_clicked_handler(const Smach::event& x);
    Smach::event_result event_mouse_motion_handler(const Smach::event& x);
    Smach::event_result event_key_down_handler(const Smach::event& x);
    Smach::event_result event_key_up_handler(const Smach::event& x);
    Smach::event_result event_refresh_tool_options(const Smach::event& x);
    Smach::event_result event_layer_click(const Smach::event& x);

};	// END of class StateNormal_Context

StateNormal::StateNormal():
    Smach::state<StateNormal_Context>("normal")
{
    insert(event_def(EVENT_STOP, &StateNormal_Context::event_stop_handler));
    insert(event_def(EVENT_REFRESH, &StateNormal_Context::event_refresh_handler));
    insert(event_def(EVENT_REFRESH_DUCKS, &StateNormal_Context::event_refresh_ducks_handler));
    insert(event_def(EVENT_UNDO, &StateNormal_Context::event_undo_handler));
    insert(event_def(EVENT_REDO, &StateNormal_Context::event_redo_handler));
    insert(event_def(EVENT_WORKAREA_MOUSE_BUTTON_DOWN, &StateNormal_Context::event_mouse_button_down_handler));
    insert(event_def(EVENT_WORKAREA_MULTIPLE_DUCKS_CLICKED, &StateNormal_Context::event_multiple_ducks_clicked_handler));
    insert(event_def(EVENT_REFRESH_TOOL_OPTIONS, &StateNormal_Context::event_refresh_tool_options));
    insert(event_def(EVENT_WORKAREA_MOUSE_MOTION,		&StateNormal_Context::event_mouse_motion_handler));
    insert(event_def(EVENT_WORKAREA_MOUSE_BUTTON_DRAG,	&StateNormal_Context::event_mouse_motion_handler));
    insert(event_def(EVENT_WORKAREA_KEY_DOWN, &StateNormal_Context::event_key_down_handler));
    insert(event_def(EVENT_WORKAREA_KEY_UP, &StateNormal_Context::event_key_up_handler));
    insert(event_def(EVENT_WORKAREA_LAYER_CLICKED, &StateNormal_Context::event_layer_click));

}

StateNormal::~StateNormal()
{
}

void StateNormal_Context::refresh_cursor()
{
    // Check the current state and return when applicable
    synfig::String sname;
    sname = get_canvas_view()->get_smach().get_state_name();

    if (sname != "normal") {
        return;
    }

    // Change the cursor based on key flags
    if (get_rotate_flag() && !get_scale_flag()) {
        // TODO Do not change the cursor in WorkArea::DragMode mode, but actually not stable enough to catch
        // real DRAGBOX mode (go to DRAGNONE too quick)
        get_work_area()->set_cursor(Gdk::EXCHANGE);
        return;
    }

    if (!get_rotate_flag() && get_scale_flag()) {
        get_work_area()->set_cursor(Gdk::SIZING);
        return;
    }

    if (get_rotate_flag() && get_scale_flag()) {
        get_work_area()->set_cursor(Gdk::CROSSHAIR);
        return;
    }

    if (get_lock_animation_flag()) {
        get_work_area()->set_cursor(Gdk::DRAFT_LARGE);
        return;
    }

    // Default cursor for Transform tool
    get_work_area()->set_cursor(Gdk::ARROW);

}

StateNormal_Context::StateNormal_Context(CanvasView* canvas_view):
    canvas_view_(canvas_view),
    duck_dragger_(new DuckDrag_Combo()),
    ctrl_pressed(),
    alt_pressed(),
    shift_pressed()
{
    duck_dragger_->canvas_view_ = get_canvas_view();

    // Set up the tool options dialog
    options_table.attach(*manage(new Gtk::Label(_("Transform Tool"))),	0, 2, 0, 1, Gtk::EXPAND | Gtk::FILL, Gtk::EXPAND | Gtk::FILL, 0, 0);
    options_table.attach(*manage(new Gtk::Label(_("Ctrl to rotate"), Gtk::ALIGN_START)),	0, 2, 1, 2, Gtk::EXPAND | Gtk::FILL, Gtk::EXPAND | Gtk::FILL, 0, 0);
    options_table.attach(*manage(new Gtk::Label(_("Alt to scale"), Gtk::ALIGN_START)),	0, 2, 2, 3, Gtk::EXPAND | Gtk::FILL, Gtk::EXPAND | Gtk::FILL, 0, 0);
    options_table.attach(*manage(new Gtk::Label(_("Shift to constrain"), Gtk::ALIGN_START)),	0, 2, 3, 4, Gtk::EXPAND | Gtk::FILL, Gtk::EXPAND | Gtk::FILL, 0, 0);

    options_table.show_all();

    get_work_area()->set_allow_layer_clicks(true);
    get_work_area()->set_duck_dragger(duck_dragger_);
}

StateNormal_Context::~StateNormal_Context()
{
    get_work_area()->clear_duck_dragger();
    get_work_area()->reset_cursor();
}

DuckDrag_Combo::DuckDrag_Combo():
    original_mag(),
    bad_drag(),
    move_only(),
    is_moving(false),
    canvas_view_(NULL),
    scale(false),
    rotate(false),
    constrain(false) // Lock aspect for scale
{ }

void
DuckDrag_Combo::begin_duck_drag(Duckmatic* duckmatic, const synfig::Vector& offset)
{
    is_moving = false;
    last_move = Vector(1, 1);

    const DuckList selected_ducks(duckmatic->get_selected_ducks());
    DuckList::const_iterator iter;

    bad_drag = false;

    drag_offset = duckmatic->find_duck(offset)->get_trans_point();

    // snap=drag_offset-duckmatic->snap_point_to_grid(drag_offset);
    // snap=offset-drag_offset_;
    snap = Vector(0, 0);

    // Calculate center
    Point vmin(100000000, 100000000);
    Point vmax(-100000000, -100000000);
    positions.clear();
    int i;

    for (i = 0, iter = selected_ducks.begin(); iter != selected_ducks.end(); ++iter, i++) {
        Point p((*iter)->get_trans_point());
        vmin[0] = min(vmin[0], p[0]);
        vmin[1] = min(vmin[1], p[1]);
        vmax[0] = max(vmax[0], p[0]);
        vmax[1] = max(vmax[1], p[1]);
        positions.push_back(p);
    }

    center = (vmin + vmax) * 0.5;

    if ((vmin - vmax).mag() <= EPSILON) {
        move_only = true;
    } else {
        move_only = false;
    }

    synfig::Vector vect(offset - center);
    original_angle = Angle::tan(vect[1], vect[0]);
    original_mag = vect.mag();
}

void
DuckDrag_Combo::duck_drag(Duckmatic* duckmatic, const synfig::Vector& vector)
{
    if (!duckmatic) {
        return;
    }

    if (bad_drag) {
        return;
    }

    // Override axis lock set in workarea when holding down the shift key
    if (!move_only && (scale || rotate)) {
        duckmatic->set_axis_lock(false);
    }

    synfig::Vector vect;

    if (move_only || (!scale && !rotate)) {
        vect = duckmatic->snap_point_to_grid(vector) - drag_offset + snap;
    } else {
        vect = duckmatic->snap_point_to_grid(vector) - center + snap;
    }

    last_move = vect;

    const DuckList selected_ducks(duckmatic->get_selected_ducks());
    DuckList::const_iterator iter;

    Time time(duckmatic->get_time());

    int i;

    if (move_only || (!scale && !rotate)) {
        for (i = 0, iter = selected_ducks.begin(); iter != selected_ducks.end(); ++iter, i++) {
            if ((*iter)->get_type() == Duck::TYPE_VERTEX || (*iter)->get_type() == Duck::TYPE_POSITION) {
                (*iter)->set_trans_point(positions[i] + vect, time);
            }
        }

        for (i = 0, iter = selected_ducks.begin(); iter != selected_ducks.end(); ++iter, i++) {
            if ((*iter)->get_type() != Duck::TYPE_VERTEX && (*iter)->get_type() != Duck::TYPE_POSITION) {
                (*iter)->set_trans_point(positions[i] + vect, time);
            }
        }
    }

    if (rotate) {
        Angle::deg angle(Angle::tan(vect[1], vect[0]));
        angle = original_angle - angle;

        if (constrain) {
            float degrees = angle.get() / 15;
            angle = Angle::deg(degrees > 0 ? std::floor(degrees) * 15 : std::ceil(degrees) * 15);
        }

        Real mag(vect.mag() / original_mag);
        Real sine(Angle::sin(angle).get());
        Real cosine(Angle::cos(angle).get());

        for (i = 0, iter = selected_ducks.begin(); iter != selected_ducks.end(); ++iter, i++) {
            if ((*iter)->get_type() != Duck::TYPE_VERTEX && (*iter)->get_type() != Duck::TYPE_POSITION) {
                continue;
            }

            Vector x(positions[i] - center), p;

            p[0] = cosine * x[0] + sine * x[1];
            p[1] = -sine * x[0] + cosine * x[1];

            if (scale) {
                p *= mag;
            }

            p += center;
            (*iter)->set_trans_point(p, time);
        }

        for (i = 0, iter = selected_ducks.begin(); iter != selected_ducks.end(); ++iter, i++) {
            if (!((*iter)->get_type() != Duck::TYPE_VERTEX && (*iter)->get_type() != Duck::TYPE_POSITION)) {
                continue;
            }

            Vector x(positions[i] - center), p;

            p[0] = cosine * x[0] + sine * x[1];
            p[1] = -sine * x[0] + cosine * x[1];

            if (scale) {
                p *= mag;
            }

            p += center;
            (*iter)->set_trans_point(p, time);
        }
    } else if (scale) {
        if (!constrain) {
            if (abs(drag_offset[0] - center[0]) > EPSILON) {
                vect[0] /= drag_offset[0] - center[0];
            } else {
                vect[0] = 1;
            }

            if (abs(drag_offset[1] - center[1]) > EPSILON) {
                vect[1] /= drag_offset[1] - center[1];
            } else {
                vect[1] = 1;
            }
        } else {
            Real amount;

            if ((drag_offset - center).mag() < EPSILON) {
                amount = 1;
            } else {
                amount = vect.mag() / (drag_offset - center).mag();
            }

            vect[0] = vect[1] = amount;
        }

        if (vect[0] < EPSILON && vect[0] > -EPSILON) {
            vect[0] = 1;
        }

        if (vect[1] < EPSILON && vect[1] > -EPSILON) {
            vect[1] = 1;
        }

        for (i = 0, iter = selected_ducks.begin(); iter != selected_ducks.end(); ++iter, i++) {
            if (((*iter)->get_type() != Duck::TYPE_VERTEX && (*iter)->get_type() != Duck::TYPE_POSITION)) {
                continue;
            }

            Vector p(positions[i] - center);

            p[0] *= vect[0];
            p[1] *= vect[1];
            p += center;
            (*iter)->set_trans_point(p, time);
        }

        for (i = 0, iter = selected_ducks.begin(); iter != selected_ducks.end(); ++iter, i++) {
            if (!((*iter)->get_type() != Duck::TYPE_VERTEX && (*iter)->get_type() != Duck::TYPE_POSITION)) {
                continue;
            }

            Vector p(positions[i] - center);

            p[0] *= vect[0];
            p[1] *= vect[1];
            p += center;
            (*iter)->set_trans_point(p, time);
        }

    }

    last_move = vect;

    if ((last_move - Vector(1, 1)).mag() > 0.0001) {
        is_moving = true;
    }

    if (is_moving) {
        duckmatic->signal_edited_selected_ducks(true);
    }

    // then patch up the tangents for the vertices we've moved
    duckmatic->update_ducks();
}

bool
DuckDrag_Combo::end_duck_drag(Duckmatic* duckmatic)
{
    if (bad_drag) {
        return false;
    }


    if (is_moving) {
        duckmatic->signal_edited_selected_ducks();
        return true;
    } else {
        duckmatic->signal_user_click_selected_ducks(0);
        return false;
    }
}

Smach::event_result
StateNormal_Context::event_refresh_tool_options(const Smach::event& /*x*/)
{
    return Smach::RESULT_ACCEPT;
}

Smach::event_result
StateNormal_Context::event_stop_handler(const Smach::event& /*x*/)
{
    canvas_view_->stop();
    return Smach::RESULT_ACCEPT;
}

Smach::event_result
StateNormal_Context::event_refresh_handler(const Smach::event& /*x*/)
{
    canvas_view_->rebuild_tables();
    canvas_view_->get_work_area()->queue_render_preview();
    return Smach::RESULT_ACCEPT;
}

Smach::event_result
StateNormal_Context::event_refresh_ducks_handler(const Smach::event& /*x*/)
{
    canvas_view_->queue_rebuild_ducks();
    return Smach::RESULT_ACCEPT;
}

Smach::event_result
StateNormal_Context::event_undo_handler(const Smach::event& /*x*/)
{
    canvas_view_->get_instance()->undo();
    return Smach::RESULT_ACCEPT;
}

Smach::event_result
StateNormal_Context::event_redo_handler(const Smach::event& /*x*/)
{
    canvas_view_->get_instance()->redo();
    return Smach::RESULT_ACCEPT;
}

Smach::event_result
StateNormal_Context::event_mouse_button_down_handler(const Smach::event& x)
{

    const EventMouse& event(*reinterpret_cast<const EventMouse*>(&x));

    switch (event.button) {
    case BUTTON_RIGHT:
        canvas_view_->popup_main_menu();
        return Smach::RESULT_ACCEPT;

    default:
        return Smach::RESULT_OK;
    }
}

Smach::event_result
StateNormal_Context::event_mouse_motion_handler(const Smach::event& x)
{

    const EventMouse& event(*reinterpret_cast<const EventMouse*>(&x));

    set_ctrl_pressed(event.modifier & GDK_CONTROL_MASK);
    set_alt_pressed(event.modifier & GDK_MOD1_MASK);
    set_shift_pressed(event.modifier & GDK_SHIFT_MASK);

    return Smach::RESULT_OK;
}

void
StateNormal_Context::set_ctrl_pressed(bool value)
{
    if (ctrl_pressed == value) {
        return;
    }

    ctrl_pressed = value;

    if (ctrl_pressed) {
        if (get_canvas_view()->get_work_area()->get_selected_ducks().size() <= 1
           ) {
            set_rotate_flag(false);
            set_alternative_flag(true);
        } else {
            set_rotate_flag(true);
            set_alternative_flag(false);
        }
    } else {
        set_alternative_flag(false);
        set_rotate_flag(false);
    }
}

void
StateNormal_Context::set_alt_pressed(bool value)
{
    if (alt_pressed == value) {
        return;
    }

    alt_pressed = value;
    set_scale_flag(alt_pressed);
}

void
StateNormal_Context::set_shift_pressed(bool value)
{
    if (shift_pressed == value) {
        return;
    }

    shift_pressed = value;
    set_constrain_flag(shift_pressed);
}

void
StateNormal_Context::set_space_pressed(bool value)
{
    if (space_pressed == value) {
        return;
    }

    space_pressed = value;
    set_lock_animation_flag(space_pressed);
}

Smach::event_result
StateNormal_Context::event_key_down_handler(const Smach::event& x)
{
    // event.modifier yet not set when ctrl (or alt or shift)
    // key pressed event handled. So we need to check this keys manually.
    // We may encountred some cosmetic problems with mouse-cursor image
    // if user will redefine modifier keys.
    // Anyway processing of keys Ctrl+Right, Ctrl+Left etc will works fine.
    // see 'xmodmap' command
    const EventKeyboard& event(*reinterpret_cast<const EventKeyboard*>(&x));

    switch (event.keyval) {
    case GDK_KEY_Control_L:
    case GDK_KEY_Control_R:
        set_ctrl_pressed(true);
        break;

    case GDK_KEY_Alt_L:
    case GDK_KEY_Alt_R:
    case GDK_KEY_Meta_L:
        set_alt_pressed(true);
        break;

    case GDK_KEY_Shift_L:
    case GDK_KEY_Shift_R:
        set_shift_pressed(true);
        break;

    case GDK_KEY_space:
        set_space_pressed(true);
        break;

    default:
        set_ctrl_pressed(event.modifier & GDK_CONTROL_MASK);
        set_alt_pressed(event.modifier & GDK_MOD1_MASK);
        set_shift_pressed(event.modifier & GDK_SHIFT_MASK);
        break;
    }

    return Smach::RESULT_REJECT;
}

Smach::event_result
StateNormal_Context::event_key_up_handler(const Smach::event& x)
{
    // see event_key_down_handler for possible problems
    const EventKeyboard& event(*reinterpret_cast<const EventKeyboard*>(&x));

    switch (event.keyval) {
    case GDK_KEY_Control_L:
    case GDK_KEY_Control_R:
        set_ctrl_pressed(false);
        break;

    case GDK_KEY_Alt_L:
    case GDK_KEY_Alt_R:
    case GDK_KEY_Meta_L:
        set_alt_pressed(false);
        break;

    case GDK_KEY_Shift_L:
    case GDK_KEY_Shift_R:
        set_shift_pressed(false);
        break;

    case GDK_KEY_space:
        set_space_pressed(false);
        break;

    default:
        break;
    }

    return Smach::RESULT_REJECT;
}

Smach::event_result
StateNormal_Context::event_layer_click(const Smach::event& x)
{
    const EventLayerClick& event(*reinterpret_cast<const EventLayerClick*>(&x));

    if (event.layer) {
    } else {
    }

    switch (event.button) {
    case BUTTON_LEFT:
        if (!(event.modifier & Gdk::CONTROL_MASK)) {
            canvas_view_->get_selection_manager()->clear_selected_layers();
        }

        if (event.layer) {
            std::list<Layer::Handle> layer_list(canvas_view_->get_selection_manager()->get_selected_layers());
            std::set<Layer::Handle> layers(layer_list.begin(), layer_list.end());

            if (layers.count(event.layer)) {
                layers.erase(event.layer);
                layer_list = std::list<Layer::Handle>(layers.begin(), layers.end());
                canvas_view_->get_selection_manager()->clear_selected_layers();
                canvas_view_->get_selection_manager()->set_selected_layers(layer_list);
            } else {
                canvas_view_->get_selection_manager()->set_selected_layer(event.layer);
            }
        }

        return Smach::RESULT_ACCEPT;

    case BUTTON_RIGHT:
        canvas_view_->popup_layer_menu(event.layer);
        return Smach::RESULT_ACCEPT;

    default:
        return Smach::RESULT_OK;
    }
}

Smach::event_result
StateNormal_Context::event_multiple_ducks_clicked_handler(const Smach::event& x)
{


    std::list<synfigapp::ValueDesc> value_desc_list;

    // Create a list of value_descs associated with selection
    const DuckList selected_ducks(get_work_area()->get_selected_ducks());
    DuckList::const_iterator iter;

    for (iter = selected_ducks.begin(); iter != selected_ducks.end(); ++iter) {
        synfigapp::ValueDesc value_desc((*iter)->get_value_desc());

        if (!value_desc.is_valid()) {
            continue;
        }

        value_desc_list.push_back(value_desc);
    }

    Gtk::Menu *menu = manage(new Gtk::Menu());
    menu->signal_hide().connect(sigc::bind(sigc::ptr_fun(&delete_widget), menu));

    const EventMouse& event(*reinterpret_cast<const EventMouse*>(&x));
    canvas_view_->get_instance()->make_param_menu(
        menu,
        canvas_view_->get_canvas(),
        value_desc_list,
        event.duck ? event.duck->get_value_desc() : synfigapp::ValueDesc()
    );

    menu->popup(3, gtk_get_current_event_time());

    return Smach::RESULT_ACCEPT;
}
